Transformer



E935., G, OL, COLE QQQAES TRANSFORMER Y Filed Nov. 20, 1933 .l 2 Sheets$heet l 29 l k l W' A Patented Feb. 26, 1935 eral Transformer Corporation, Chicago, lll., a corporation of Illinois Application'November 20,/1933, No. 698,759

6 Claims.

My invention relates to transformers and more particularly to small transformers for uses demanding a wide range of voltages from the secondaries of the transformer.

It is the principal purpose of this invention to provide a transformer of this character with a novel means of winding and mounting which permits connections from the secondaries of the transformer to be readily made at any of a multiplicity of points in the secondary windings.

It is also a purpose of this invention to provide a transformer of this character with a housing facilitating the tapping ofthe secondary at a multiplicity of points and serving also as a means for mounting the transformer u'pon a support.

Another and more specific object of the invention is the provision in the transformer and housing of this character of a novel cover attachment which permits ready access to the portion of the transformer where the multiple tapping facilities are provided, and which also serves to complete the enclosure of the transformer coils when the desired taps have been connected to theA lead wires.

Other and more specic objects and advantages of this device will appear as the description proceeds in connection with the accompanying drawings wherein the preferred form of the invention is shown. It is to be Aunderstood, however, that the drawings and description are illustrative only and are not to be taken as limiting the invention except in so far as it is limited by the claims.

In the drawings- Fig. 1 is 'a plan view looking down on the transformer with the tap cover removed;

Fig. 2 is a section substantially on the line 2 2 of Fig. 1; and

Fig. 3 is a wiring diagram illustrating some of the possible connections to be made with this transformer.

Referring now in detail to the drawings, the core of the transformer is indicated generally by the numeral 5 and may be built up of laminations in the usual fashion. The primary and secondary coils are wound about the core in the usual fashion-that is, with the primary winding on the outside, and with the secondary winding on the inside thereof. The number of windings on the primary and the total number of windings on the secondaries are fixed, and energizing leads are taken from the primary terminals out through one side of the casing, and the high voltage secondary winding also is taken out on the same side as the primary leads, while the other secondary terminals are exposed on the other side of the casing for ready attachment of lead wires thereto.

The casing consists of a pair of mounting plates y means for mounting the transformer upon a support. The casing members 6 and 7 also have the center thereof cut out to provide the apertures such as indicated at 12a (see Fig. 1), and sur# rounding these apertures is another upturned flange 13 which is substantially of the size necessary to permit projection of the secondary coil 14 out past the flange 13 as indicated for example in Fig. 2. The flange 13 has along two opposite side edges thereof the ears such as 15 and 16 which ears have punched therein suitable depressions 17 and 18 adapted to receive the projections such as 19 and 20 on the cover members 21 and 22. In their general aspects, casing members 6 and 7 are substantially duplicates, the principal difference between such casing members being in the spacing of the mounting openings such as 23, 24, 25, etc. from the corners of the extensions 9, 10, 11, and 12.

Suitable lscrew'bolts indicated generally by the numeral 26 serve to clamp the casing members to the core of the transformer, and the cover members 21 and 22 are adapted to snap on the anges 13 by merely pressing them down over the flanges `so as to force the rounded projections such as 19 and 20 into the depressions such as 17 and 18. The cover members 21 and 22 are lined with a suitable insulating lining indicated in Fig. 2 by the numeral 27 which lining may be secured by the rivets 28 or other suitable securing means.

Over the primary windings and secondary windings 14, I provide the insulating sheet 29 which is provided with a series of eyelets such as 30 to which the wires'such as 31 which provide the various taps from the secondary are soldered Vor otherwise secured. 'I'he insulating sheet 29 is preferably of a relatively stiff non-conducting and heat resistant material so that the lead-in wires 32 which pass through the eyelets 33 of the cover member 21 may be soldered. It will be noted from an inspection of Fig. 1 that a multiplicity of taps are taken from the secondary and connected to the eyelets 30, and on the insulating sheet 29. I stamp numbers for the eyelets 30 so that the odd numbers appear on one side of the Sheet 29, and even numbers appear on the other side. 'I'he secondary coils 14 are in reality a plurality of separate windings of different turns as indicated best by the circuit diagram of Fig. 3. With the multiplicity of taps available with this device, I find that I can connect up the lead-in wires 32 in such a fashion as to obtain a wide selection of voltages andrcurrents so as to fit the transformer for rsubstantially universal usage from a single primary voltage.

The advantages of such a transformer, particularly to one who is engaged in building special radio receiving apparatus or repairing the many types of radio receivers in use, are readily apparent. With a small stock of transformers, the

repair man can select a range of secondary voltages which with the schematic diagram he can properly connect up in the receiver to give the correct tvoltage'supply for the various elements of the tubes used in the receiver. The openings such as 23, 24, and 25 are so spaced apart along each side of the transformer as to give a wide range of selection as the distances between mounting screws and the H-shape of these openings also facilitates their adaptation to various mountings. Since the casing members 6 and 'I are interchangeable and duplicates with respect to their general characteristics, a relatively small number of parts need be made up to give a wide range of mountings. the drawings, the widest distance between mounting screws is found at the top of Fig. 1 which gives substantially four inches. At the bottom of Fig. 1, the widest distance is three and threefourth inches, while the narrowest distance is three inches. The end `mountings on the left in Fig. 1 give the widest distance as three and one- -fourth inches, and the narrowest distance as two and one-half inches. Measuring across the core 5, as for example along the vertical edge of Fig. 2, the narrowest distance is less than two inches by a slight amount, while the widest distance is approximately three inches.

Thus in a single transformer I provide a highly flexible mounting arrangement and at the same time a highly flexible secondary potential. The cover 21 carries the lead-in wires which are knotted within the cover to hold them in place until the one who is'installing the transformer makes the final connections between the lead-in wires and the terminal eyelets such as 30.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

.1. A transformer of the character described having a core, a primary winding, and a plurality of separate secondary windings on the core, an insulating sheet over said windings, certain of the secondary windings having intermediate taps, said secondary windings all being brought out and anchored to said sheet, a removable cover for said sheet and windings having lead-in wires) passing For example, in the form shown in therethrough for connection to said terminals and taps through their anchors to the sheet.

2. A transformer of the character described having a core, a primary winding, and a plurality of separate secondary windings on the core, ce1'- tain of the secondary windings having intermediate taps, a pair of casing members mounted on opposite sides of the transformer core and having at their corners upstanding flange portions provided with mounting apertures, the spacing between mounting apertures being unequal along the opposite edges of a casing member.

3. A transformer of the character described having a core, a primary winding, and a plurality of separate secondary windings on the core, an insulating sheet over said windings, certain of the secondary windings having intermediate taps, said secondary windings all being brought out and anchored to said sheet, a pair of casing members mounted on opposite sides of the transformer core and having at their corners upstanding flange portions provided with mounting apertures, the spacing between mounting apertures being unequal along the opposite edges of a casing member.

4. A transformer of the character described having a core, primary and secondary windings wound on the core, said core having a central portion on which the windings are wound and an outer rectangular portion, a pair Vof casing-members mounted on opposite sides of said rectangular portion each having corner flanges apertured for mounting the transformer, and each member having an opening at the center about the windings and a cover for said windings.

5. A transformer of the character described having a core, primary and secondary windings wound on the core, said core having a central portion on which the windings are Wound and an outer rectangular portion, a pair of casing members mounted on opposite sides of said rectangular portion, said casing members having openings at the center about said windings, a terminal sheet for the secondary windings projecting out `through one of said openings, and a cover for said sheet detachably mounted on the corresponding -casing member.

6. A transformer of the character `described having a core, primary and secondary windings wound on the core, said core having a central portion on which the windings are wound and an outer rectangular portion, a pair of casing members mounted on opposite sides of said rectangular portion said casing members having openings at the center about said windings, a termi' nal sheet `for the secondary windings projecting out through one of said openings, a cover for said sheet lead wires carried by said cover, and cooperating means on` the cover and the corresponding casing member for mounting the cover in place.

GERARD MCL. COLE. 

